>>> good morning, i'm chris jansing. tomorrow could be the most critical night in the race for president. the candidates are giving us a preview of their debate strategies now. president obama left a swanky resort where he is doing debate prep to deliver pizzas to volunteers in nevada. it was a break from what we hear he is working on including shortening and sharpening his answers. not his idea of a good time. >> it was very nice. basically, they are keeping me indoors all the time. it's a drag. they're making me do my homework. >> mitt romney rallied in a crowd in denver. even though he's been practicing zingers, he tried to play down the need for a victory. >> people want to know who is going to win, who is going to score the punches and who is going to make the biggest difference in the arguments they make and there's going to be all the scoring of winning and losing. in my view it's not the winning and losing, the people themselves, it's something bigger than that. these debates are an opportunity for each of us to